Vania



(No Model.) 4 SheetsSheet 1.

F. M, KENNEDY.

MACHINE FOR THREADING BOLTS AND NUTS.

No. 572,541. Patented Nov. 1, 1887.

INVENTOR,

(N0 MOaLy 4 SheetsSheet 2. P. M. KENNEDY.

MACHINE FOR THRBADING BOLTS AND NUTS. No. 372.541.

Patented Nov. 1, 1887.

WITNESSES:

A INVENTOR,

n. D. C.

(No Model.) 4 Sheets-Sheet 3.

F. M. KENNEDY.

MACHINE FOR THREADING BOLTS AND NUTS.

No. 372,541. Patented Nov 1, 188-7.

N. Pawns. PholoLiihugmphcnwguhmglan, n. c.

(No Model.) 4 Sheets-Sheet 4.

F. M. KENNEDY.

MACHINE FOR THREADING BOLTS AND'NUTS.

No. 372,541. Patented Nov. 1 1887;

WITNESSES N. PETERS, Rholo-Lilhngmphon.Washmgicm mic.

UNTTED STATES PATENT OFFICE.

FRANK M. KENNEDY, OF YOUNGSTOWVN, OHIO, ASSIGNOR TO ED\VIN BELL, JR, OF SAME PLACE, AND HENRY J. KENNEDY, OF HADLEY, PENNSYL- VANIA.

MACHINE FOR THREADING BOLTS AND NUTS.

SPECIFICATION forming part of Letters Patent No. 372,541, dated November 1, 1887.

Application filed April 26, 1887. Serial No. 236,229. (No model.)

To aZZ whom, it may concern: 7

Be it known that I, FRANK M. KENNEDY, a citizen of the United States, residing at Youngstown, in the county of Mahoning and State of Ohio, have invented certain new and useful Improvements in Bolt and Nut Thread matically cutting screw-threads in nuts.

My invention consists in the combination, in a screw-threading machine, of two wheels or disks mounted upon a shaft and revolving together, one of said wheels being provided with means for holding the article to be operated upon, and the other wheel being provided with screw-threading devices-such as taps or dies-with means for causing said threading devices to automatically advance toward and by a rotary movement cut a thread upon the article held upon the other wheel, and to then reverse their movement and retreat from such article.

My invention further consists in the combi nation,with amachine for cutting threads upon bolts, of novel and automaticallyoperated devices for finishing the heads of the same simultaneously with the operation of cutting the threads.

My invention still further consists in the combination, with a machine for cutting threads upon bolts, of a novel device for automatically pointing the same.

My invention still further consists in the combination, with an organized machine for threading bolts, of novel means for grasping and holding the bolts while being threaded.

My invention still further consists in the novel construction, combination, and arrangement of parts, hereinafter described and specifically claimed.

Referring to the accompanying drawings, Figure 1 is an elevation, partly in section, of a machine embodying my improvements; Fig.

2, an elevation taken from the opposite side to Fig. 1; Fig. 3, a top view, and Figs. 4, 5, 6, and 7 detail views illustrating the construction of separate parts.

A designates the frame-work of the machine, and B the main shaft, journaled in suitable bearings on the frame A and receiving motion through a band-wheel. Said shaft is hollow and serves as a conduit for the conveyance of oil to the cutting and threading tools, as will be presently described.

0 and D designate, respectively, two large flat-faced wheels mounted upon the shaft B and receiving motion therefrom. The wheel 0 carries the thread-cutting and pointing devices, and the wheel D the device for holding the article to be operated upon and the device for finishing the heads of the bolts. These parts that is, the thread-cutting devices and the device for holding the bolts and finishing the heads-are mounted opposite one another upon the two wheels 0 D, and there may be any desired number of the same, the drawings showing a machine having four sets of such devices.

I will first describe the parts of the machine carried by the wheel I), and will then describe the parts carried by the wheel 0, the former being the device for holding the bolt in position and the devices for finishing the head of. the same, and the latter being the devices for cutting the thread and finishing the point. As the several sets of devices mounted upon the wheel 0 are duplicates of each other, and those upon wheel D are also duplicates of each other, a description of one of each will be snf ficient, and I will therefore describe in detail 0 the parts shown upon the top of each wheel.

In the drawings, E designates a casting sccured in any suitable manner upon the face of the wheel D. e is a lug upon the face of the wheel near the inner edge of the block E, and 5 c is a small movable block that slides and works upon a dovetail, c". A lover, F, is pivoted atf'to the block 6 and atf to one of the spokes of the wheel D. The lever F at its inner end is provided with an antifriction 0c roller, f that is in contact'with the face of a stationary cam, f Said cam is formed with a hole through which the main shaft 13 passes, and the cam is supported independently of the shaft by an arm, f, extending from the frame A. The arrangement of parts described is such that upon rotating the wheel D the block 6 is caused to approach the stationary block or lug e, and after maintaining its position during about half the revolution of the wheel to recede to its original position. The stationary and movable blocks 6 and e are grooved upon their adjacentfaces, and their object is to hold headless bolts or bolts which have no squared portion below the head. When the machine is designed to operate upon bolts having the usual squared portion back of the head, both of the blocks e and e maybe made stationary, the squared portion of the bolt preventing its turning. Just below the space between the blocks 6 e is arran ed a rod that slides in a hole in the block 6 and has its outer end turned up and forked. A spring, F, serves to project said rod outwardly, and the function of the forked rod is to sustain the outward end or point of the bolt, the rod be ing forced back by the impact of the advancing die as the screw is being formed and resuming its position at or near the point of the bolt as the die recedes.

G designates a cutting'tool mounted on the end of a sliding shaft, g,journa1ed on the casting E. Said cutting-tool is designed to cut and finish the head of the bolt, and the shaftg is surrounded by a spiral spring, y, whose tendency is to draw the tool G away from the bolt. Upon the outside of the casting Ea lever, is pivoted atg the other end of said lever being free and projecting out slightly from the edge of the wheel D, as shown. The end of the shaft 9 bears against the side of the said lever 9", and hence when the lever is pressed in toward the W1. 01 the tool G is advancedand broughtinto gxtact with the head of the bolt.

H designates a cogwheel keyed upon the shaft g, and H H H H similar wheels in train with wheel H. When the wheel D is revolved, the cog-wheel H" meshes with and is revolved by an are shaped rack, H which is mounted upon the frame of the machine, there by setting in motion the tool G. A small friction-pulley, H, is secured upon the shaft with gear H, and contacts with a friction-surface, H upon the frame A just before the gearwheel meets the rack, thereby imparting motion to the train, which is continued by said rack. An arc-shaped cam-plate, I, is mounted upon the frame of the machine outside of the edge of the wheel D, and as the said wheel revolves the end of the lever g following the face of the cam, causes the tool G to advance toward and recede from the head of the belt at proper times.

The parts of the screw-threading appliances which are mounted upon the wheels 0 are similar in many respects to the partsjust described, and are constructed and arranged as follows: A casting, K, is secured upon the surface of the wheel, and in said casting is journaled a sliding shaft, Z,which carries upon one end a die-holder, L, and at the other end contacts with a lever, 1 and is surrounded by a spiral spring, Z. The shaft Z also carries a cog-wheel, M, meshing with the wheels M M 8m, of'a train. A cam plate, N, concentric withthe wheel 0, is secured upon a bracket, N, and is adjustable thereon, being secured to said bracket by bolts n a, passing through slots nn. The'function of the lever l" andcamplate N is to cause the die L to advance toward and recede from the bolt, and the object of making the cam-plate N-adjustable is to adapt the machine to cut threads of various lengths. The

die-holder L has a cavity, L, and in said cavity is placed a cutting-tool, L, which forms the points of the bolts as the threads are be ing cut thereon. The tool L slides freely in the cavity L, and is pressed toward the die by a spring, L An arc-shaped rack,P, is secured to the frame A, and when the wheel 0 revolvefs this rack engages with the .cogwheel M* and turns the shaftl and the dieholder L. Upon the shaft with the cog-wheel start the train of cog-wheels M M M in thedirection reverse to that imparted by the rack P, and a second rack, Q, which is in alignment 'with the rack P,- continues such reverse mo tion positively as the wheel 0 continues to revolve, so as to cause the die to come off the bolt. Asecond friction-surface, P is arranged near the beginning of the rack P, so as to again reverse the direction of motion of the train of gearing as it approaches the rack.

As before stated, the main shaft Bis hollow, and serves as an oil conduit, and a number of small bent pipes, 0 0 0, lead from said shaft to above the threading-tools, the said pipes being intended for the conveyance of lubricating fluid to the tools.

While I. have described my invention as being adapted for cutting screw-threads upon bolts, I will call attention to the fact that it is equally welladapted for use as a nut-tapping machine, the only alterations required being the substitution of taps for dies upon the wheel 0 and the proper arrangement of the blocks 6 and 6 upon the wheel Operation: The bolts to be operated upon, being placed one after the other as the wheels revolve, between the blocks 6 e, are gripped and held firmly by the movement of the block 6, 01', when both blocks are stationary, by the movement of the tool G, which is moved up against the head of the bolt by the lever 9 contacting with the first projecting section of the cam-plate I. The die-holderL upon the wheel 0 now moves toward the bolt by the action of the cam-plateN upon the lever Z, and, turn ing by the contact of cog-wheel M" with rack O, the die is set in motion,which is continued till the cog-wheel M passes the end of the rack P. The friction-wheel now, contacting with the friction-surface, starts the train of cog-wheels and the die revolving in the reverse direction, and the rack Q, next coming into play, keeps up this motion until the die is screwed entirely off the bolt. \Vhilethe bolt is thus being threaded by the die the tool G upon wheel D has been again advanced by the lever g into contact with the head of the bolt, and the cog-wheel H, meshing with rack 1-1 causes this tool G' to revolve and cut and finish the head. The operation is entirely automatically performed from the moment the bolt is placed in the machine until it is discharged in a finished state, the point having been finished by the tool L as the thread is being cut. The adjustability of the cam-plate N allows of the machine cutting different lengths of threads, for if said eamplate be adjusted up toward the rack the die will not be brought into contact with the bolt until the wheel M has traveled some distance along the rack, and hence a shorter thread will be cut than when the die is brought into contact with the boltjust as the rack and cog-wheel come into engagement.

Having described my invention I claim- 1. In a machine for screw-threading bolts, the combination, with the die-operating mceh anism and dies, of the wheel I) and the bolt holding devices thereon, consisting of the cam f, the levers F, the sliding blocks 0, secured to said levers, and the stationary blocks 6, all constructed and arranged substantially as described.

2. The combination, in a machine for making bolts, of a revolving wheel or disk carrying bolt-holding devices, with a tool for tinishing the head of the bolt, gearing for rotating said tool, and a stationary areshaped rack with which said gearing engages as the wheel revolves, all constructed and arranged substantially as described.

3. In a bolt or nut threading machine, the combination of two similar wheels or disks adapted to travel together, one of said wheels carrying devices for holding the article to be operated upon, the other carrying operating tools and gearing for imparting motion to the same, with two stationary racks adapted to engage alternately with the gearing as the said wheels revolve, and thereby turn said gearing alternately in opposite directions, substantially as described.

at. In a bolt-threading machine, the combination of two wheels or disks mounted upon a common shaft and turning together, one of said wheels carrying threading devices and gearing for operating the same and the other carrying a device for finishing the heads of bolts, and gearing for rotating said device, with stationary racks adapted to engage with said gearing, and thereby rotate said threading and finishing tools, substantially as described.

5. In a machine for cutting threads, the combination, with the thread-cutting tool, of devices, substantially as described, for causing said tools to turn alternately in opposite directions, and comprising, essentially, a shaft upon which said tool is mounted, a cog-wheel on said shaft, other cog-wheels gearing therewith, and two racks adapted to alternately engage with the same cog-wheel in the train, as set forth.

6. In a machine for cutting'threads on bolts, the combination, with a wheel carrying a cutting-tool mounted upon a sliding shaft, gearing for rotating said tool, and a pivoted lever at one end of said sliding shaft, of a stationary cam-plate adapted to operate said lever, and thereby force said tool forward, and stationary racks adapted to mesh with the gearing, and thereby turn the tool as the wheel revolves, as set forth.

7. In a thread-cutting machine, the combination, with the wheel 0, the sliding shaft Z, the tool L, mounted thereon, cog-wheels M M M, and rack P, of the pivoted lever Z and the can't-plate N, adjustable toward and from said rack, substantially as described.

8. In an organized bolt-threading machine, constructed substantially as described, the combination, with the bolt-holder and the threading-tool, ofthe forked rodf"and spring F.

In testimony that I claim the foregoing I have hereunto set my hand this 18th day of April, 1887.

FRANK M. KENNEDY.

\Vitnesses:

JOHN F. ATOHESON, J os. 13. CoNNoLLY. 

